Multiple lymph nodes visible in the mediastinum may be due to lung inflammation, tumor, tuberculosis, etc. 1. Inflammation: Inflammation of the lungs, inflammation of the chest cavity area, etc. can lead to inflammatory enlargement and multiple lymph nodes adjacent to the mediastinum. 2. Tumor: primary mediastinal tumor, or esophageal cancer, lung cancer and other malignant tumors may metastasize to the mediastinal lymph nodes, and secondary malignant tumors may appear, causing multiple enlargement of mediastinal lymph nodes. 3. Tuberculosis: Tuberculosis can make tuberculosis bacillus infected to the mediastinum, resulting in multiple lymph node enlargement in the mediastinum, which can also be accompanied by systemic symptoms such as night sweating, emaciation, low-grade fever and fatigue. Mediastinal lymph nodes can also be seen in other diseases, it is recommended that patients go to the regular hospital in time, by the doctor according to the different causes of targeted treatment.